package com.feixiu.mapreduce.partitioner;

import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Mapper;

import java.io.IOException;

/**
 * <KEYIN,  map阶段输入的key的类型：LongWritable
 * VALUEIN,map阶段输入value的类型：text
 * KEYOUT,map阶段输出的key类型   ；text
 * VALUEOUT>  map阶段输出的value类型   ：IntWritable
 */
public class WordCountMapper extends Mapper <LongWritable, Text,Text, IntWritable>{
    private  Text outK = new Text();
    private  IntWritable outV = new IntWritable(1);
    @Override
    protected void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException {

        //1.获取一行
        String line = value.toString();
        //2.切割
        String[] words = line.split(" ");
        //3.循环写出
        for (String word:words){
            if ("".equals(word)){
                continue;
            }
            outK.set(word);
            context.write(outK,outV);
        }
    }
}
